Relay Pin Description June 2, 2019 5V Relay: Pinout, Description, Working & Datasheet. Relays are most commonly used switching device in electronics. Let us learn how to use one in our circuits based on the requirement of our project. components101.com Satellite Tv DiagramBasic Wiring Circuits220v Ac Plug Wiring6 3 Wire With GroundResidential Electrical LayoutRed Wire PositiveAlternator Diagram Wiring3 Prong Outlet Switch